import asyncio
import datetime
import json
import logging
import textwrap
import traceback
from collections import defaultdict
from logging import LogRecord
from typing import Any, Dict

import discord
import humanize
import psutil
import sentry_sdk
from discord.ext import commands, tasks
from structured_config import ConfigFile

from tuxbot.core.bot import Tux
from tuxbot.core.i18n import (
    Translator,
)
from tuxbot.core.utils.functions.extra import (
    command_extra,
    ContextPlus,
)
from tuxbot.core.utils.data_manager import cogs_data_path
from .config import LogsConfig
from .functions.utils import sort_by
from ...core.utils.functions.utils import shorten

log = logging.getLogger("tuxbot.cogs.Logs")
_ = Translator("Logs", __file__)


class GatewayHandler(logging.Handler):
    def __init__(self, cog):
        self.cog = cog
        super().__init__(logging.INFO)

    def filter(self, record: LogRecord):
        return (
            record.name == "discord.gateway"
            or "Shard ID" in record.msg
            or "Websocket closed " in record.msg
        )

    def emit(self, record: LogRecord):
        self.cog.add_record(record)


class Logs(commands.Cog):
    def __init__(self, bot: Tux):
        self.bot = bot
        self.process = psutil.Process()
        self._batch_lock = asyncio.Lock()
        self._data_batch: list[Dict[str, Any]] = []
        self._gateway_queue: asyncio.Queue = asyncio.Queue()
        self.gateway_worker.start()  # pylint: disable=no-member

        self.__config: LogsConfig = ConfigFile(
            str(cogs_data_path("Logs") / "config.yaml"),
            LogsConfig,
        ).config

        self._resumes: list[datetime.datetime] = []
        self._identifies: defaultdict[Any, list] = defaultdict(list)

        self.old_on_error = bot.on_error
        bot.on_error = self.on_error

        if self.bot.instance_name != "dev":
            # pylint: disable=abstract-class-instantiated
            sentry_sdk.init(
                dsn=self.__config.sentryKey,
                traces_sample_rate=1.0,
                environment=self.bot.instance_name,
                debug=False,
                attach_stacktrace=True,
            )

    def cog_unload(self):
        self.bot.on_error = self.old_on_error

    async def on_error(self, event, *args, **kwargs):
        raise  # pylint: disable=misplaced-bare-raise

    # =========================================================================
    # =========================================================================

    def webhook(self, log_type):
        webhook = discord.Webhook.from_url(
            getattr(self.__config, log_type),
            session=self.bot.session,
        )
        return webhook

    async def send_guild_stats(self, e, guild):
        e.add_field(name="Name", value=guild.name)
        e.add_field(name="ID", value=guild.id)
        e.add_field(name="Shard ID", value=guild.shard_id or "N/A")
        e.add_field(
            name="Owner", value=f"{guild.owner} (ID: {guild.owner.id})"
        )

        bots = sum(member.bot for member in guild.members)
        total = guild.member_count
        online = sum(
            member.status is discord.Status.online for member in guild.members
        )

        e.add_field(name="Members", value=str(total))
        e.add_field(name="Bots", value=f"{bots} ({bots / total:.2%})")
        e.add_field(name="Online", value=f"{online} ({online / total:.2%})")

        if guild.icon:
            e.set_thumbnail(url=guild.icon_url)

        if guild.me:
            e.timestamp = guild.me.joined_at

        await self.webhook("guilds").send(embed=e)

    def add_record(self, record: LogRecord):
        self._gateway_queue.put_nowait(record)

    async def notify_gateway_status(self, record: LogRecord):
        types = {"INFO": ":information_source:", "WARNING": ":warning:"}

        emoji = types.get(record.levelname, ":heavy_multiplication_x:")
        dt = datetime.datetime.utcfromtimestamp(record.created)
        msg = (
            f"{emoji} `[{dt:%Y-%m-%d %H:%M:%S}] "
            f"{await shorten(record.msg, 1500)}`"
        )
        await self.webhook("gateway").send(msg)

    def clear_gateway_data(self):
        one_week_ago = datetime.datetime.utcnow() - datetime.timedelta(days=7)
        to_remove = [
            index
            for index, dt in enumerate(self._resumes)
            if dt < one_week_ago
        ]
        for index in reversed(to_remove):
            del self._resumes[index]

        for _, dates in self._identifies.items():
            to_remove = [
                index for index, dt in enumerate(dates) if dt < one_week_ago
            ]
            for index in reversed(to_remove):
                del dates[index]

    async def register_command(self, ctx: ContextPlus):
        if ctx.command is None:
            return

        command = ctx.command.qualified_name
        self.bot.stats["commands"][command] += 1
        message = ctx.message
        if ctx.guild is None:
            destination = "Private Message"
            guild_id = None
        else:
            destination = f"#{message.channel} ({message.guild})"
            guild_id = ctx.guild.id

        log.info(
            "%s: %s in %s > %s",
            message.created_at,
            message.author,
            destination,
            message.content,
        )
        async with self._batch_lock:
            self._data_batch.append(
                {
                    "guild": guild_id,
                    "channel": ctx.channel.id,
                    "author": ctx.author.id,
                    "used": message.created_at.isoformat(),
                    "prefix": ctx.prefix,
                    "command": command,
                    "failed": ctx.command_failed,
                }
            )

    # =========================================================================
    # =========================================================================

    @tasks.loop(seconds=0.0)
    async def gateway_worker(self):
        record = await self._gateway_queue.get()
        await self.notify_gateway_status(record)

    @commands.Cog.listener()
    async def on_command_completion(self, ctx: ContextPlus):
        await self.register_command(ctx)

    @commands.Cog.listener()
    async def on_socket_response(self, msg):
        self.bot.stats["socket"][msg.get("t")] += 1

    @commands.Cog.listener()
    async def on_guild_join(self, guild: discord.guild):
        e = discord.Embed(colour=0x53DDA4, title="New Guild")  # green colour
        await self.send_guild_stats(e, guild)

    @commands.Cog.listener()
    async def on_guild_remove(self, guild: discord.guild):
        e = discord.Embed(colour=0xDD5F53, title="Left Guild")  # red colour
        await self.send_guild_stats(e, guild)

    @commands.Cog.listener()
    async def on_message(self, message: discord.message):
        if message.guild is None:
            e = discord.Embed(colour=0x0A97F5, title="New DM")  # blue colour
            e.set_author(
                name=message.author,
                icon_url=message.author.avatar.url,
            )
            e.description = message.content
            if len(message.attachments) > 0:
                e.set_image(url=message.attachments[0].url)
            e.set_footer(text=f"User ID: {message.author.id}")
            await self.webhook("dm").send(embed=e)

    @commands.Cog.listener()
    async def on_command_error(
        self, ctx: ContextPlus, error: commands.CommandError
    ):
        await self.register_command(ctx)
        if not isinstance(
            error, (commands.CommandInvokeError, commands.ConversionError)
        ):
            return

        error = error.original
        if isinstance(error, (discord.Forbidden, discord.NotFound)):
            return

        self.bot.console.log(
            "Command Error, check sentry or discord error channel"
        )

        e = discord.Embed(title="Command Error", colour=0xCC3366)
        e.add_field(name="Name", value=ctx.command.qualified_name)
        e.add_field(name="Author", value=f"{ctx.author} (ID: {ctx.author.id})")

        fmt = f"Channel: {ctx.channel} (ID: {ctx.channel.id})"
        if ctx.guild:
            fmt = f"{fmt}\nGuild: {ctx.guild} (ID: {ctx.guild.id})"

        e.add_field(name="Location", value=fmt, inline=False)
        e.add_field(
            name="Content",
            value=textwrap.shorten(ctx.message.content, width=512),
        )
        e.add_field(
            name="Bot Instance",
            value=self.bot.instance_name,
        )

        exc = "".join(
            traceback.format_exception(
                type(error), error, error.__traceback__, chain=False
            )
        )
        e.description = f"```py\n{exc}\n```"
        e.timestamp = datetime.datetime.utcnow()
        await self.webhook("errors").send(embed=e)

        e.description = _(
            "```An error occurred, the bot owner has been advertised...```",
            ctx,
            self.bot.config,
        )
        e.remove_field(0)
        e.remove_field(1)
        e.remove_field(1)

        if self.bot.instance_name != "dev":
            sentry_sdk.capture_exception(error)
            e.set_footer(text=sentry_sdk.last_event_id())

        await ctx.send(embed=e)

    @commands.Cog.listener()
    async def on_socket_raw_send(self, data):
        if '"op":2' not in data and '"op":6' not in data:
            return

        back_to_json = json.loads(data)
        if back_to_json["op"] == 2:
            payload = back_to_json["d"]
            inner_shard = payload.get("shard", [0])
            self._identifies[inner_shard[0]].append(datetime.datetime.utcnow())
        else:
            self._resumes.append(datetime.datetime.utcnow())

        self.clear_gateway_data()

    # =========================================================================
    # =========================================================================

    @command_extra(name="commandstats", hidden=True, deletable=True)
    @commands.is_owner()
    async def _commandstats(self, ctx: ContextPlus, limit=20):
        counter = self.bot.stats["commands"]
        width = len(max(counter, key=len)) + 1

        if limit > 0:
            common = counter.most_common(limit)
        else:
            common = counter.most_common()[limit:]

        output = "\n".join(f"{k:<{width}}: {c}" for k, c in common)

        await ctx.send(f"```\n{output}\n```")

    @command_extra(name="socketstats", hidden=True, deletable=True)
    async def _socketstats(self, ctx: ContextPlus):
        delta = datetime.datetime.now() - self.bot.uptime
        minutes = delta.total_seconds() / 60

        counter = self.bot.stats["socket"]
        if None in counter:
            counter.pop(None)

        total = sum(self.bot.stats["socket"].values())
        cpm = total / minutes

        e = discord.Embed(
            title=_("Sockets stats", ctx, self.bot.config),
            description=_(
                "{} socket events observed ({:.2f}/minute):",
                ctx,
                self.bot.config,
            ).format(total, cpm),
            color=discord.colour.Color.green(),
        )

        for major, events in sort_by(counter.most_common()).items():
            if events:
                output = "\n".join(f"{k}: {v}" for k, v in events.items())
                e.add_field(
                    name=major.capitalize(),
                    value=f"```\n{output}\n```",
                    inline=False,
                )

        await ctx.send(embed=e)

    @command_extra(name="uptime")
    async def _uptime(self, ctx: ContextPlus):
        uptime = humanize.naturaltime(
            datetime.datetime.now() - self.bot.uptime
        )
        await ctx.send(f"Uptime: **{uptime}**")